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C H A P T E R 4 Advanced Configuration
IGMP pruning can only be used in VLANs that have an IP link. En-
abling IGMP pruning stops Layer 2 forwarding of IP multicast pack-
ets in all other VLANs without IP links.
Only enable IGMP pruning (on this device) when it is connected be-
tween the device receiving the packets and an IP multicast routing de-
vice. Or, disable IGMP pruning (on this device) when it is connected
between the device transmitting the packets and an IP multicast rout-
ing device.
IP multicast routing in a
stack
When enabling IP multicast routing on the management VLAN in a
stack, you MUST assign the IP addresses consecutively to the man-
agement VLAN, for example, x.x.x.77, x.x.x.78, x.x.x.79 etc.
Enabling IGMP pruning IGMP pruning implements a system where only the necessary
amount of IP multicast packets are bridged. To enable IGMP pruning:
1 Select VLAN/Routing Setup.
2 Click Advanced>IP Routing>IGMP.
3 Check Enabled.
4 In Pruning timeout, type the new value.
5 Click OK.
IP Filtering
Purpose IP filtering is available when you are routing between nets or VLANs.
It enables you to send data packets to specific workstations or user
groups across the VLANs. You define the members in these user
groups and the type of IP filtering. IP filtering uses either IP addresses
or specified IP protocols. It is specific for the individual switches, and
therefore, right-click the switch to access the IP filtering functions.
Before you start Look at the architecture of your network before starting. Make a list
of proposed user groups and their filter parameters. Then look at the
individual members to be included in the groups. This prevents work-
stations or subnets from being excluded when IP filtering is enabled.
500.book Page 75 Thursday, September 2, 1999 1:50 PM